Which is an exlucsive chordata character

Options

A. True coelom
B. Pharyngeal gill slits
C. Bilateral symmetry
D. Triploblastic

Answer

To determine which character is exclusive to Chordata, we can analyze the given options step by step:

### Step 1: Understand the options
We have four options to consider:
1. True coelom
2. Pharyngeal gill slits
3. Bilateral symmetry
4. Triploblastic organization

### Step 2: Analyze True Coelom
- A true coelom is a body cavity that is completely lined by mesoderm.
- However, true coelom is not exclusive to chordates as it is also found in other animal phyla such as annelids, arthropods, and mollusks.
- Therefore, this option cannot be the exclusive character of Chordata.

### Step 3: Analyze Pharyngeal Gill Slits
- Pharyngeal gill slits are paired structures found in the pharyngeal region of chordates.
- These structures are essential for respiration and feeding in various chordate species, especially in primitive chordates and during certain life stages in advanced chordates like fishes and amphibians.
- This feature is unique to chordates and is not found in other animal phyla.
- Thus, pharyngeal gill slits are indeed an exclusive character of Chordata.

### Step 4: Analyze Bilateral Symmetry
- Bilateral symmetry refers to a body plan in which the left and right sides are mirror images.
- This characteristic is not exclusive to chordates as it is also present in other phyla such as platyhelminthes (flatworms) and mollusks.
- Therefore, this option cannot be the exclusive character of Chordata.

### Step 5: Analyze Triploblastic Organization
- Triploblastic organisms have three germ layers: ectoderm, mesoderm, and endoderm.
- This feature is also not exclusive to chordates as it is found in other animal groups, including non-chordates.
- Hence, this option cannot be the exclusive character of Chordata.

### Conclusion
After analyzing all the options, the exclusive character of Chordata is **pharyngeal gill slits**.

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